In the hierarchy, move the prison word game object above the other game objects within the Canvas, place it directly under the Canvas - does this resolve the issue?
If not…
Change the z-index of the prison word game object to be closer to the camera (currently at -10) than the other game objects within the canvas, you can pop into 3D mode to get a view of where they are all sitting.
I played around with what you said but that wasn’t the issue. Then I had a d’oh moment If I’d been paying attention to the video (Section 3, lecture 29, 13:25) I would have noticed that just dragging the sprite from the Assets to the canvas creates the wrong type of instance (Same as choosing GameObject>2D Object>Sprite). What you need to do to get it on the canvas is choose GameObject>UI>Image and drag the sprite from Assets to the Image’s SourceImage selection box.
I’d like to know why sprites added to the scene as sprites are not rendered visible. Is that a camera setting?
One possibility is that the size of the Canvas may be ENORMOUS compared to the area which the Main Camera is viewing. One may be looking at the huge Canvas area in Game View, while looking at the tiny Camera area in Scene View. So when one tries to position the Sprite in the Scene View, it would not show up in Game View because the camera area is microscopic relative to the Canvas. But if one were to use a UI Image as a child of the Canvas, it would then scale along with the size of the Canvas so that it becomes visible as normal in Game View.